The hormone testosterone is the male hormone in males and excreted from the testes of cells called cells to encircle and increases the secretion of the secretion of LH, which is produced from the pituitary gland below the brain, which is produced when the male reached puberty, between 11 to 13 years of age of male, and the hormone testosterone function The first function is that it is responsible for the growth and appearance of the male genital organ of the human male and is still a fetus in the mother's abdomen as the failure of secretion of the testes at this stage of the development of the fetus leads to the birth of a male child but female genital organs. The second function is the result of the secretion of this hormone during puberty, which leads to the emergence and growth and the emergence of male qualities such as increasing the size of the penis and seminal vesicles and prostate and lead to the emergence of hair and chin and mustache and chest in the man and also pubic hair and increase the hair of the two men and also amplify the vocal cords, This hormone also increases the sexual desire of the young man and increases the tendency for girls. This hormone with another hormone secreted from the pituitary gland, which is the hormone FSH, is a key function in the formation and production of spermatozoa. Is the status of youth in adulthood.